12f683 has no
• EEDATH
• EEADRH
registers and cannot read the flash pgm memory , along with many other chips


from the manual


READCODE


Read the value at location Address in code space into Var. Some PIC16F and
PIC18 devices allow program code to be read at run-time. This may be useful for
additional data storage or to verify the validity of the program code. For PIC16F
devices, 14-bit-sized data can be read from word code space Addresses